When an ideal gas is compressed adiabatically, its temperature rises: the molecules on an average have more kinetic energy than before. The kinetic energy increases:
1. | because of collisions with moving parts of the wall only. |
2. | because of collisions with the entire wall. |
3. | because the molecules get accelerated in their motion inside the volume. |
4. | because of the redistribution of energy amongst the molecules. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA cubic vessel (with faces horizontal + vertical) contains an ideal gas at NTP. The vessel is being carried by a rocket which is moving at a speed of \(500~\text{ms}^{-1}\) in the vertical direction. The pressure of the gas inside the vessel as observed by us on the ground:
1. | remains the same because \(500~\text{ms}^{-1}\) is very much smaller than \(v_{rms}\) of the gas. |
2. | remains the same because the motion of the vessel as a whole does not affect the relative motion of the gas molecules and the walls. |
3. | will increase by a factor equal to \(\left(\dfrac{v_{rms}^2+(500)^2}{v_{rms}^2}\right) \) where \(v_{rms}^2\) was the original mean square velocity of the gas. |
4. | will be different on the top wall and bottom wall of the vessel. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology\(1\) mole of an ideal gas is contained in a cubical volume V, ABCDEFGH at \(300\) K (figure). One face of the cube (EFGH) is made up of a material which totally absorbs any gas molecule incident on it. At any given time:
1. | the pressure on EFGH would be zero. |
2. | the pressure on all the faces will be equal. |
3. | the pressure on EFGH would be double the pressure on ABCD. |
4. | the pressure on EFGH would be half that on ABCD. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyABCDEFGH is a hollow cube made of an insulator (figure). Face ABCD has a positive charge on it. Inside the cube, we have ionised hydrogen. The usual kinetic theory expression for pressure:
(a) | will be valid. |
(b) | will not be valid, since the ions would experience forces other than due to collisions with the walls. |
(c) | will not be valid, since collisions with walls would not be elastic. |
(d) | will not be valid because isotropy is lost. |
Choose the correct alternatives:
1. only (a)
2. (b), (c)
3. (b), (d)
4. (c), (d)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDiatomic molecules like hydrogen have energies due to both translational as well as rotational motion. From the equation in kinetic theory, \(PV = \dfrac{2}{3}E\) \(E\) is:
1. | the total energy per unit volume. |
2. | only the translational part of energy because rotational energy is very small compared to translational energy. |
3. | only the translational part of the energy because during collisions with the wall, pressure relates to change in linear momentum. |
4. | the translational part of the energy because rotational energies of molecules can be of either sign and its average over all the molecules is zero. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology